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Ch.2 - Atoms, Molecules, and Ions
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.2 - Atoms, Molecules, and IonsProblema 108a2
Capitolo 2, Problema 108a2

Cyclopropane is an interesting hydrocarbon. Instead of having three carbons in a row, the three carbons form a ring, as shown in this perspective drawing (see Figure 2.18 for a prior example of this kind of drawing):
Chemical structures of oxirane and ethanol, illustrating organic compounds.
Cyclopropane was at one time used as an anesthetic, but its use was discontinued, in part because it is highly flammable. (a) How does it differ from that of propane?

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Step 1: Identify the structure of cyclopropane. Cyclopropane is a three-carbon ring structure, where each carbon is bonded to two other carbons and two hydrogen atoms.
Step 2: Compare the structure of cyclopropane to propane. Propane is a linear hydrocarbon with three carbon atoms in a row, each bonded to hydrogen atoms to satisfy the valence of carbon.
Step 3: Note the differences in bonding and geometry. Cyclopropane has a ring structure, which introduces angle strain due to the 60-degree bond angles, whereas propane has a tetrahedral geometry with bond angles of approximately 109.5 degrees.
Step 4: Consider the implications of the ring structure. The ring structure of cyclopropane makes it more reactive and less stable compared to the linear structure of propane.
Step 5: Summarize the key differences. Cyclopropane differs from propane in its ring structure, bond angles, and stability, which contribute to its higher reactivity and flammability.

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Cycloalkanes

Cycloalkanes are hydrocarbons that contain carbon atoms arranged in a ring structure. Unlike linear alkanes, such as propane, which have a straight-chain configuration, cycloalkanes exhibit unique properties due to their cyclic nature. This ring formation can lead to increased strain and reactivity, influencing their chemical behavior and stability.
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Rules for Naming Cyclic Alkanes

Flammability

Flammability refers to the ability of a substance to ignite and burn in the presence of an ignition source. Cyclopropane is highly flammable due to its low flash point and the presence of C-H bonds that readily react with oxygen. Understanding flammability is crucial for assessing the safety and handling of hydrocarbons, especially in medical or industrial applications.
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Physical Properties Example

Structural Isomers

Structural isomers are compounds that have the same molecular formula but differ in the arrangement of atoms. For example, propane (C3H8) is a straight-chain alkane, while cyclopropane (C3H6) is a cyclic structure. This difference in structure can lead to variations in physical and chemical properties, such as boiling points and reactivity, which are important for understanding their uses and behaviors.
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Isomers
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Domanda del libro di testo
Consider a sample of calcium carbonate in the form of a cube measuring 2.005 in. on each edge. If the sample has a density of 2.71 g>cm3, how many oxygen atoms does it contain?
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Domanda del libro di testo

Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: (d) hydrogen tellurate ion.

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Domanda del libro di testo

Fill in the blanks in the following table:

Cation Anion Formula Name

Lithium oxide

Fe2+ PO43-

Al2(SO4)3

Copper(II) nitrate

Cr3+ I−

MnClO2

Ammonium carbonate

Zinc perchlorate

Complete the third column of the table.

Complete the fourth column of the table.

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Domanda del libro di testo

Cyclopropane is an interesting hydrocarbon. Instead of having three carbons in a row, the three carbons form a ring, as shown in this perspective drawing (see Figure 2.18 for a prior example of this kind of drawing):

Cyclopropane was at one time used as an anesthetic, but its use was discontinued, in part because it is highly flammable. (b) The three carbon atoms are necessarily in a plane. What do the different wedges mean?

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Domanda del libro di testo

Fill in the blanks in the following table:

Cation Anion Formula Name

Lithium oxide

Fe2+ PO43-

Al2(SO4)3

Copper(II) nitrate

Cr3+ I−

MnClO2

Ammonium carbonate

Zinc perchlorate

Complete the first column of the table.

864
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Domanda del libro di testo

Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: (a) BrO4- (b) SeO32- (c) arsenate ion

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